A concave-convex microtextured surface was fabricated on GCr15 bearing steel using laser processing techniques. The effects of texture type,texture density,and load on the lubrication performance of MoS2 films were systematically investigated. The results indicate that the lubricating lifetime of MoS2 on the concave-convex microtextured surface (556 min) is significantly greater than that on the pit microtextured surface (39 min) and the smooth surface (46 min). Notably,an ultra-low friction coefficient of 0.064 was observed on the concave-convex microtextured specimen under a normal load of 30 N. Analysis results reveals that the micro-convex structures within the concave-convex microtexture,when compressed by the grinding ball,retain MoS2 within adjacent micropores. This results in a continuous release of the lubricant during the friction process,which greatly extends the lubrication life. Furthermore,lower texture densities are found to be more beneficial for enhancing the lubrication performance of MoS2 in comparison with higher densities. These findings have significant implications for improving the effectiveness of MoS2 solid lubricants in practical applications.
关键词
表面织构/MoS2薄膜/固体润滑/摩擦学特性
Key words
surface texture/MoS2 films/solid film lubrication/tribological properties
万方数据